December 8, 1937. Fort Johnston, Nyasaland: Looking toward the northwest. The exit of the Shire River from Lake Nyasa is seen at the upper right, and the low range which extends toward Cape Maclear lies in the background. Since Lake Nyasa stands at an elevation of 1500 feet, the climate here is hot and trying during the summer season and the swamps about are notoriously unhealthful. Tsetse fly has greatly restricted the cattle industry. c. 2500 feet. 06:45.