Copalita River, or Río Copalita, is a river in Huatulco that is popular with surfers and river rafters. During Huatulco’s rainy season from May to October, the Copalita River swells, becoming an ideal spot for river rafting excursions. Río Copalita empties into the ocean several miles northeast of Tangolunda. On the beach, you are likely to find local surfers and boogie boarders hanging out. The surfing is so popular here that there is an annual Huatulco surfing and boogie board championship that dates back to 2003. Rafting along the Copalita River takes rafters through a series of adrenaline-pumping rapids – everything from Class I to Class IV rapids. Class I rapids are considered easy with fast moving water, but few obstructions and small waves. Class IV rapids are advanced, with intense turbulent water and a risk of unavoidable obstacles and waves. Tours that include river rafting typically require rafters to travel between 5 to 7 miles (8 to 11 km) on the Copalita River.