Sightings of these creatures are reported widely. In North America, they range from as far north as Wyoming to as far south as southern Mexico and possibly even Central America. They have been sighted as far west as Utah and as far east as Georgia and South Carolina.
They live in diverse habitats, from deserts to swamps. However, one thing that is always consistent about these creatures is that they are associated with the presence of water. They are constantly seen around rivers, lakes, reservoirs, etc.
Therefore, the places where they are most likely to be found would probably be bodies of water surrounded by sparsely-populated wilderness areas. This is also probably where a cryptozoologist would need to go if he or she wanted to search for them.