Emerald Cave is a natural cave located along the Colorado River in Nevada. It is known for its stunning green waters, which are caused by sunlight filtering through the cave's entrance and reflecting off the riverbed. The cave is a popular destination for kayaking and boat tours, attracting visitors who want to experience its unique beauty. The cave is part of the Lake Mead National Recreation Area, which offers various outdoor activities. Visitors can explore the surrounding area, enjoy hiking trails, and take in the scenic views of the Black Canyon. Emerald Cave is a highlight for those seeking adventure and natural wonders.