Based on the world record nomination from America Records Institute (AMRI) and Decision No. WK/USA.INDIA/954/2023/No.410, World Records Union (WorldKings) officially Titicaca as the world’s highest lake for commercial vessels navigating on January 19th, 2023.
Lake Titicaca is a large freshwater lake in the Andes mountains on the border of Bolivia and Peru. Lake Titicaca has a surface elevation of 3,812 m. The "highest lake" claim is generally considered to refer to commercial craft. Numerous smaller bodies of water (that are not considered lakes) around the world are at higher elevations. For many years, the largest vessel afloat on the lake was the 2,200-ton, 79 m SS Ollanta. Today, the largest vessel is most likely the similarly sized train barge/float Manco Capac, operated by PeruRail.
The lake consists of two nearly separate subbasins connected by the Strait of Tiquina, which is 800 m across at the narrowest point. The larger subbasin, Lago Grande (also called Lago Chucuito), has a mean depth of 135 m and a maximum depth of 284 m. The smaller subbasin, Wiñaymarka (also called Lago Pequeño, "little lake"), has an average depth of 9 m and a maximum depth of 40 m. The overall average depth of the lake is 107 m.
Five major river systems feed into Lake Titicaca. In order of their relative flow volumes these are Ramis, Coata, Ilave, Huancané, and Suchez. More than 20 other smaller streams empty into Titicaca. The lake has 41 islands, some of which are densely populated.
Since 2000, Lake Titicaca has experienced constantly receding water levels. Between April and November 2009 alone, the water level dropped by 81 cm, reaching the lowest level since 1949. This drop is caused by shortened rainy seasons and the melting of glaciers feeding the tributaries of the lake. Water pollution is also an increasing concern because cities in the Titicaca watershed grow, sometimes outpacing solid waste and sewage treatment infrastructure.
According to Wikipedia