The country bordering Lake Titicaca is Peru. Peru is a country located in western South America, bordered by Ecuador, Colombia, Brazil, Bolivia, Chile, and the Pacific Ocean. It is home to the ancient Incan civilization and is known for its diverse geography, including the Andes Mountains, Amazon rainforest, and coastal deserts. The lake, which is shared with Bolivia, is the highest navigable lake in the world and is an important source of water for the region.