As the Tasman Glacier has receded in recent years, a long narrow arm of the lake has penetrated the tongue along the left-lateral margin. The waters here contain a lower density of suspended sediment and take on a bluish hue, whilst ‘bergy bits’ drift away from the ice cliff. On the left is the lateral moraine with a boulder several metres-long, whilst beyond the boat is the receding debris-covered tongue (March 2007).