Final answer:
The largest lake in Guatemala is Lake Izabal, located in the eastern part of the country. It is a crucial ecological asset within Guatemala's diverse landscapes and is the largest lake fully contained within the nation.
Step-by-step explanation:
The largest lake in Guatemala is Lake Izabal, also known as Lago de Izabal. It is situated in the eastern part of the country, within a region that possesses a rich ecological diversity, including tropical forests. Despite Guatemala being bordered by bodies of water such as the Pacific Ocean to the southwest and sharing its northern frontier with Mexico, Lake Izabal stands out as the most expansive lake entirely within the country's borders.
Guatemala is known for its vibrant culture and representative democracy, with Spanish as its official language, and it boasts the largest population in Central America. Moreover, not only does it have impressive freshwater resources like Lake Izabal, but it is also graced with coastal lines along the Caribbean Sea to the east. Although not as large as some lakes such as Lake Titicaca or the Great Lakes in North America, Lake Izabal is of significant size and ecological importance within Guatemala.