The Magical Rainbow in Mount Cook and Blue ice in Tasman Glacier

Traveling is amazing. It allows me to leave the daily routine behind and gives me time to just slow down and think. My road trip to the South Island of New Zealand was not only eye-opening but mind-opening. The breathtaking landscape inspired me and had me opened me up to new perspectives on life.

Why are there so many songs about a rainbow?? #rainbow #glacier #tasman #mountcook

The lakes in New Zealand’s South Island

Leaving our homestay in Tekapo, we continued our expedition towards the south along the Southern Alps. There are seven major lakes on the South Island that offer truly awe-inspiring views, and each of them has its own identity. Queenstown lies in the middle of Lake Wakatipu; Lake Wanaka is popular with two major ski fields; Lake Tekapo is a great spot for star gazing at the mountainside Mount John Observatory; Lake Ohau offers incredible mirror images of the Southern Alps; Lake Te Anau leads to the magnificent Milford Sound; Lake Hawea is a great place for activities like kayaking, windsurfing, fishing, and boating; and that morning we drove along Lake Pukaki. The lake is famously known as the ‘Lake-town’ in ‘The Hobbit: The Desolation o Smaug.’ The lake also leads to Mount Cook (the highest peak in the Southern Alps) and Tasman Glacier (New Zealand’s largest glacier), which was our destination for the day.

Lake Pukaki

Lake Pukaki, and why is it baby-blue?

Lake Pukaki 2Lake Pukaki has a distinctive, iridescent baby-blue color. Why? When the glaciers move through the valleys they grind and crush the brittle Sandstone, Greywacke, and Schist rocks. This creates a fine powder known as ‘Glacier Rock Flour’ which is suspended in the water in high concentrations and empties into Lake Pukaki where it mixes with the freshwater of the lake. The heavy rock flour particles sick to the bottom and only the very fine particles are left floating in suspension. As light penetrates into the lake all the colors of the light spectrum are absorbed, except the baby-blue. This color refracted off the tiny particles of rock flour gives Lake Pukaki its unique identity. Check the lake out on the Google Map, you will see the color of the lake stands out from the rest of its neighboring bodies of water.

Tasman Glacier and a face-to-face with the Terminal Face

It was exciting to see the highest peak in the Southern Alps and visit the largest glacier in a day. It was not my first time visiting a glacier – I visited Folgefonna in Norway, and had a fun Glacier Hike (Visit: Glacier Hiking: Folgefonna!); and Jökulsárlón in Iceland, and had a taste of the thousand-year-old glacial ice! (Visit: On the Tip of Your Tongue: Jökulsárlón). It was, though, my first time going to a glacier in the southern hemisphere; More, we hopped on a boat this time and view the glacier in the water. There are several glaciers in the Southern Alps, including the Mueller Glacier, Hooker Glacier, Franz Josef Glacier, and Fox Glacier… while the Tasman Glacier, with its length of 23.5 km, is the largest in New Zealand.

Morning! Tasman Valley @ Mount Cook National Park. Take my breath away #mountcook #cook

We reached the Hermitage Hotel early in the morning and it’s a pitstop and gathering point for the tours and expeditions on Mount Cook. We signed up for a Glacier Explorers Tasman Glacier tour and after a short bus ride and a short walk through the trails, we started to board the boats at one end of the glacier. The tour guide would take us up to the Terminal Face, and on the route, we saw the beautiful blue ice and breathtaking mountain ranges on both sides of the glacier. The weather was unstable and we were caught in a downpour right after we got on the boat. Luckily, the rain stopped for the rest of the trip and we could enjoy the beautiful glacier under the sun, and we got to see a rainbow straddle across the mountain as we were leaving.😊

Tasman Glacier 1

How the Tasman Glacier is formed?

I was not surprised to learn that glaciers have been shaping and reshaping the landscape of the Southern Alps for the last 2 million years. The Tasman Valley that we were in was carved by the Tasman Glacier over 18 thousand years ago during the ice age. The glacier was at its largest 18 thousand years ago, and it was 200m above and 400m below the current valley floor and over 100km long. It was until 13 thousand years ago the earth started to warm and the glacier started to retreat. As the ice melted, the suspended debris, which was scooped up by the glacier earlier, was deposited once again. In the Tasman Valley, this is known as TILL. The depth of the current valley is 400m of TILL left by the retreating Tasman Glacier.

Tasman Glacier 4

The beginning of the glacier, known as the Neve, is at 2300m above sea level. The Neve receives 20 to 30 of snow annually, which compacts down under its own weight to form around 7m of glacial ice. The Glacier then flows downhill for 17km until it comes up against the Mount Cook range, and then it takes a sharp left turn and flows for another 7km before terminating at Tasman Lake – this 7km of the glacier is visible from the lake, where our boat was. The first 17km of the Tasman Glacier is pristine and white, while the last 7km is covered in a rock mantle – also known as the Melt Line. The upper ice there melted away to expose the Moraine that was once frozen inside.

It was amazing that although it sounded simple, it was a long process. Snow falling in the Neve takes about 300 to 600 years to move its way through the glacier and finally end up in Tasman Lake – which means, the icebergs that I saw in the lake began as snow more than 300 years ago!

Tasman Glacier 3 - Ice

Blue Ice

Glacial ice is made up of millions of tiny ice crystals, and it is extremely dense (due to the weight and pressure, it got compacted down over many, many years). So, the iceberg that we saw has a distinctive ‘steel blue’ color (with intricate crystalline patterns), as it absorbs all colors of the light spectrum, except the color with the shortest wavelength – blue. As the sun penetrates into the ice, it warms the gases trapped inside. The gas expands and causes the ice to separate into individual ice crystals (Science is fun!). The ice will eventually turn white in a short period of time as the light bounces between the crystals.

Tasman Glacier 5

Terminal Face

The Terminal Face of the Tasman Glacier is fixed to the valley floor, rather than floating like an iceberg. The Terminal Face is currently in a melting and calving face, which means ice would fall into the water as it melts and breaks off from the glacier, producing icebergs. We approached the Terminal Face yet we couldn’t get too close before the ice could be collapsing any time, and even if the ice didn’t hit us, the current that formed as the ice sank would suck us into the water – and the Terminal Face actually descends for more than 200m underwater!

Tasman Glacier 2

Mount Cook

Mount Cook 6Another highlight of the day is a walk-in Mount Cook. We had a simple lunch back in the Hermitage Hotel and there are several scenic walks from the village and in the Tasman Valley. For me, my heart is set on the Hooker Valley Track (Which is an obvious choice anyway). It was because the track is relatively easy, it takes about 3 hours or so to finish, and we could see the beautiful view of Hooker Lake.

Aoraki (Mount Cook) is about 3,724 in height, and it’s the highest peak in the Southern Alps, and the summit was reduced by 10m when the East Face collapsed on 14th December 1991.

Epic Tasman Valley @ #nz #nationalpark #tasmanvalley #mtcook #hiking

Hooker Valley Track

Began at the Visitor Center or White Horse Hill campaign areas, and it increases the times by one hour return. The Hooker Valley Track is one of the most popular walks in the park as it leads up the Hooker Valley towards Aoraki / Mount Cook. Furthermore, the track passes close to the Alpine Memorial, which is a great viewpoint. It takes about 15 minutes to reach the 1st swingbridge, and about 30 minutes to the second swingbridge (a.k.a. 1-hour return); it takes about 1.5 hours to go to Hooker Lake.

Other Walks in the Valley includes the Kea Point Track, Sealy Tarns Track, Red Tarns Track, Glencoe Track, Bowen Bush Walk, and more!

Would love to mention the Mount Cook Scenic Flight take a landing on top of the peak – would be an amazing experience!

Join us!

This is a brand new e-newsletter that we are offering so much more to our readers.
If you havn't done so, join now and be a part of the community and get notified for exclusive updates, city guides, travel tips, and more!

We don’t spam!
Read our privacy policy for more info.


Leave a Reply