Lake Wakatipu is the third largest lake in New Zealand. Lake Wakatipu is 48 miles long and up to 3 miles wide, and covers an area of 113 sq. miles. It is bordered on all sides by glaciated mountains, the highest of which is Mount Earnslaw near the head of the lake. Two large rivers, the Dart and Rees, enter the lake at the head.Legend affirms that Wakatipu was the most difficult to dig because of its great depth, its rocky surroundings, and its high mountains. It took the utmost effort of the spade combined with many invocations (karakia) to excavate the bed of the lake.Because of the mountains which rise hastily from the shore of this glacier lake, Lake Wakatipu has an unusual rhythmic rise and fall in water level, roughly about 12 cm every five minutes. The best place to witness this extraordinary experience is in Bobs Cave. Popular activities on Lake Wakatipu include TSS Earnslaw cruises and wakeboarding and waterskiing.