A sag pond is a body of water, which forms as water collects in the lowest parts of the depression that forms between two strands of an active strike-slip fault. The relative motion of the two fault strands results in a stretching of the land between them, causing the land between them to sink.

Sag or SAG may refer to:

A pond is a body of standing water, either natural or man-made, that is usually smaller than a lake. They may arise naturally in floodplains as part of a river system, or they may be somewhat isolated depressions (examples include vernal pools and prairie potholes). Usually they contain shallow water with marsh and aquatic plants and animals. A few animals also make ponds, including both alligators and beavers. The type of life in a pond is generally determined by a combination of factors including water level regime (particularly depth and duration of flooding) and nutrient levels, but other factors may also be important, including presence or absence of shading by trees, presence or absence of streams, effects of grazing animals, and salinity.

Humans also make ponds. A wide variety of man-made bodies of water are classified as ponds. Some ponds are created specifically for habitat restoration, including water treatment. Others, like water gardens, water features and koi ponds are designed for aesthetic ornamentation as landscape or architectural features. Fish ponds are designed for commercial fish breeding, and solar ponds designed to store thermal energy.

Simon Harrison (born 6 September 1969 in Northampton) is a British auto racing driver. Racing mainly in saloon cars, he is best known for his time spent in the British Touring Car Championship.

After starting in karts and winning the 1985 Golden Steering Wheel Award, his first serious racing was in the Formula First Championship, ending the season third on points. In 1991 he raced in the British Formula Ford Championship, and finished the season third in the 1993 Formula Vauxhall Junior Series. In 1994 he switched to saloon cars, dominating and winning the 1994 National Saloon Championship in a Honda Civic.

His success the previous year earned him a drive in the 1995 British Touring Car Championship, with the works Total Team Peugeot in a Peugeot 405. It was a poor first season for him, finishing down in twenty-second place with just nine points. For 1996 he was replaced in the team by 1992 champion Tim Harvey. Without a drive, he spent most of his time in the following years as a test driver. In 1999 he returned to the National Saloon Championship, again winning the title, this time with a Honda Integra Type R. In 2000 he returned to the BTCC, driving in the new class B in a Ford Focus for GR Motorsport. He only drove in two rounds that year but this led to a full time drive in 2001 with a HTML ran Peugeot 306 in what was now named the production class. His four class wins early in the season helped him to win the production class title narrowly ahead of James Kaye by seven points.