The universe is all of space and time and their contents. It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments.

Lake Erie is the fourth-largest of the five Great Lakes of North America by surface area and the smallest by volume. It borders four U.S. states—Ohio, Pennsylvania, New York, and Michigan—and the Canadian province of Ontario.

Lake Titicaca is one of the most iconic and fascinating natural landmarks in South America. Straddling the border between Peru and Bolivia, it is known for its stunning beauty, rich cultural history, and unique ecological significance. There are numerous ancient ruins around the lake, such as the Chullpas (funerary towers) and Tiwanaku sites near its shores.

Lake Mweru is a freshwater lake located on the border between Zambia and the Democratic Republic of Congo (DRC) in central Africa. It is part of the Congo River basin and lies along the course of the Luapula River, which flows into the lake from the south and exits into the Luvua River in the north.

Shkodra Lake, also known as Lake Scutari, Lake Shkodër, or Skadar Lake, is the largest lake in Southern Europe. It straddles the border between Albania and Montenegro, offering stunning natural beauty and a unique ecosystem.

Lake Khanka (also known as Lake Xingkai) is a transboundary freshwater lake located on the border between Russia and China. It is the largest freshwater lake in the Russian Far East (Primorsky Krai) and the Heilongjiang Province of China.

Lake Victoria is the largest lake in Africa and the second-largest freshwater lake in the world by surface area, covering approximately 68,800 square kilometers (26,600 square miles). It is shared by three countries: Tanzania, Uganda, and Kenya.

Lake Malawi, also known as Lake Nyasa in Tanzania and Lago Niassa in Mozambique, is an African Great Lake and the southernmost lake in the East African Rift system, located between Malawi, Mozambique and Tanzania. This vast body of crystal clear freshwater fringed by beaches of golden sand is not only a scenic wonderland but it provides water sport opportunities for those looking for something beyond sun, sand and swimming.

Lake Tanganyika is one of the most remarkable natural features of East Africa and the world. The lake spans four countries: Burundi, Democratic Republic of the Congo (DRC), Tanzania, and Zambia. It is part of the East African Rift system. The lake is estimated to be 9–12 million years old, making it one of the oldest lakes in the world.

Lake Ontario is one of the five Great Lakes of North America and the easternmost of the group. Lake Ontario is bordered by the province of Ontario in Canada to the north, west, and southwest, and the state of New York in the United States to the south and east. It is the smallest of the Great Lakes by surface area but has significant depth.