The Lunan Water is an easterly flowing river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in Angus

Angus

Angus is one of the 32 local government council areas of Scotland, a registration county and a lieutenancy area. The council area borders Aberdeenshire, Perth and Kinross and Dundee City...

, Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

, that discharges to the North Sea

North Sea

In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...

 11 kilometres (6.8 mi) north of the town of Arbroath

Arbroath

Arbroath or Aberbrothock is a former royal burgh and the largest town in the council area of Angus in Scotland, and has a population of 22,785...

. Draining chiefly agricultural lands, this stream has a moderate level of turbidity

Turbidity

Turbidity is the cloudiness or haziness of a fluid caused by individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of water quality....

 and a pH

PH

In chemistry, pH is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at . Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline...

 level of approximately 8.7. Other nearby watercourses discharging to the North Sea include River North Esk

River North Esk

The North Esk is a river in Angus and Aberdeenshire, Scotland. It is formed by the meeting of the Water of Mark and the Water of Lee , and enters the North Sea four miles north of Montrose. It forms the boundary between Angus and Aberdeenshire at certain stages in its course...

 and River South Esk

River South Esk

The South Esk is a river in Angus, Scotland. It goes past Brechin and enters the North Sea at Montrose Basin. It was noted in the 19th century.-References:...

, both to the north. At its mouth the Lunan Water meets the North Sea at the hamlet of Lunan, upon Lunan Bay. The beach at Lunan Bay was voted the "best beach in Scotland" in a survey conducted in the year 2000. The 15th-century ruins of Red Castle are located at the river mouth, close to Lunan.