Horecký rybník, pond (reservoir) in Stráž pod Ralskem, Liberec Region, Czech Republic

Horecký rybník is an artificial reservoir on the Ploučnice river at the eastern edge of Stráž pod Ralskem, created as a fishpond between 1912 and 1915. Its earth dam, 881 m long at the crest and 6 m high above the bed, holds 1.7 million m³ of water over 42 ha; the Ještědský potok joins the river below the dam.

The pond was built between 1912 and 1915 on wooden piles and grates across the Ploučnice to hold back flood waves, with an earth dam 7.3 m high and 950 m long. The provincial water commission ordered the first dam and spillway repairs in 1926. Heavy vehicles, including those of the Soviet occupation army, cracked the dam; after emergency status in 1990 the road on the crest was closed, and the dam was rebuilt in 1996–1997.

The name Stráž pod Ralskem means 'guard under Ralsberg,' referring to old watchtowers that once stood on nearby hills. The area around the pond keeps this connection to its past as a defensive position, now serving as a place where locals and visitors come together for outdoor enjoyment.

A marked walking path runs along the southern edge of the pond and continues to the nearby village of Hamr na Jezeře. The route is suitable for cyclists as well, and the southwestern shore has small restaurants and shops plus a water sports center with boat rentals.

The southwestern shore has a water-ski cable tow used by skiers from across the country; in August 2013 it hosted the Memoriál Víti Kadlčíka. The reservoir itself is not used for swimming because of water quality, so visitors come for boating, fishing and watching from the bank.