Great Salt Plains State Park is a 840-acre (3.4 km2) Oklahoma state park located in Alfalfa County, Oklahoma. It is located 8 miles (13 km) north of Jet, Oklahoma on SH-38 and 12 miles (19 km) east of Cherokee. Recreational opportunities at Great Salt Plains State Park include boating, camping, picnicking, swimming, hiking, mountain biking and exploring. The Great Salt Plains Lake is located at the park and covers 9,300 acres (38 km2) with 41 miles (66 km) of shoreline and is a shallow, salty lake with fishing opportunities for catfish, saugeye, sandbass and hybrid striper. The average depth is reportedly 4 feet (1.2 m) and the impoundment capacity is 31,420 acre-feet. Salinity of the water in the reservoir is one-fourth that of sea water. Personal watercraft are not recommended. The park has RV and tent sites, comfort stations with showers, cabins, picnic sites, group shelters, swimming beach, playgrounds, boat ramps, fishing dock and equestrian trails. Horse rental is not available.

Jet is a town in southeast Alfalfa County, Oklahoma, United States. The population was 197 at the time of the 2020 Census.