Xcalak is located on the southern end of the tourist region in what municipality?
Xcalak:  Xcalak is one of the last "unspoiled" stretches of Mexican Caribbean located on the southern end of the Costa Maya. Costa Maya: Costa Maya is a small tourist region in the municipality of Othón P. Blanco in the state of Quintana Roo, Mexico, the only state bounded by the Caribbean Sea to its east.
Othón P. Blanco