Where is world's clearest lake where tourists are asked to wipe their shoes

Imagine a lake so clear that even a tiny speck of dust feels out of place. This lake exists, and visitors are politely asked to wipe their shoes before going near it. The reason is simple.

This water is the clearest ever recorded on Earth. The lake is called Rotomairewhenua, also known as Blue Lake, and it lies deep inside New Zealand’s mountains.

Where the world’s clearest lake is located

Rotomairewhenua sits inside Nelson Lakes National Park on New Zealand’s South Island. It is surrounded by alpine forests and rugged peaks. There are no roads leading to it. Reaching the lake requires effort, patience, and respect for nature.

Why tourists must wipe their shoes

The lake is sacred to the Māori tribe Ngāti Apa ki te Rā Tō. According to tradition, the water is considered a place of spiritual cleansing.

Dirt, bacteria, or mud carried on shoes can disturb its purity. Cleaning footwear before approaching the lake helps protect both its cultural value and its fragile ecosystem.

What makes the lake unbelievably clear

Scientific tests have shown underwater visibility of 70 to 80 metres, making it clearer than any other natural lake studied so far. The water flows into the lake through underground rock systems that act like natural filters. These rocks remove particles long before the water reaches the surface.

How tourists usually reach Blue Lake

Most visitors start from the town of St Arnaud. From there, the journey involves a multi-day hike, along the Travers-Sabine Track. The long walk limits crowds and helps keep the lake untouched. Swimming is discouraged, and most people admire the lake quietly from the shore.

Important things to know before visiting

Blue Lake holds no visible fish or plants near its surface, which adds to its glass-like look. Weather conditions can change quickly in this region. Visitors are advised to follow local guidelines closely. Respect is not optional here. It is part of the experience.Disclaimer: This article is intended for informational purposes only. Travel access, cultural rules, and conservation guidelines may change. Visitors should always follow official instructions and respect Māori customs.