Lake Chala is a crater lake in a caldera on the borders of Tanzania and Kenya on the eastern edge of Mount Kilimanjaro, not far from the town of Moshi and 8 km north of Taveta. Depending on the time of year, it ranges in colour from deep blue to turquoise and green, it is surrounded by a 100 meters high crater rim. The lake is fed by groundwater flows, which come from Mount Kilimanjaro, feeded and drained under ground with a rate of about 10 million m³ / year. Even the Chala loses volume. It´s level had dropped in the last 6 years, by 2.4 meters, at the start of 2011 the water level has risen again by over 1 meter.

The lake is home to the endemic Lake Chala tilapia (Oreochromis hunteri). now an on the IUCN red list of threatened species

Crocodiles were introduced to Lake Chala in the early 1900s, and in 2002, a woman was killed by a rare dwarf crocodile while swimming in the lake. Since then the local fishermen, tired of having their nets ripped to pieces, started an eradication programme by shooting and poisoning. It is doubtful if any crocodiles remain in the lake today.

This stunning volcanic area is rapidly growing in tourism and it is now possible to stay at Lake Chala at the new camp on the Tanzanian side.