The River Ness (Scottish Gaelic: "Abhainn Nis") is a river about 12 miles or 20 km long, which flows from the northern end of Loch Ness in Scotland, through Loch Dochfour, north-east to Inverness, with a total fall in height of about 16 metres before discharging into the Beauly Firth.
 The river is the origin of the name of Inverness which is from the Scottish Gaelic: "Inbhir Nis" , meaning "Mouth of the Ness".
The Siege of Inverness of 1650 was part of the Scottish Civil War that formed part of the Wars of the Three Kingdoms.
 Lewis Gordon, 3rd Marquess of Huntly, who was operating under the leadership of the royalist James Graham, 1st Marquess of Montrose, unsuccessfully laid siege to Inverness Castle which was being held by Covenanters of the Clan Fraser of Lovat under Sir James Fraser of Brea.
Loch Ness ( ; Scottish Gaelic: "Loch Nis" ] ) is a large, deep, freshwater loch in the Scottish Highlands extending for approximately 37 km southwest of Inverness.
 Its surface is 52 ft above sea level.
 Loch Ness is best known for alleged sightings of the cryptozoological Loch Ness Monster, also known affectionately as "Nessie".
 It is connected at the southern end by the River Oich and a section of the Caledonian Canal to Loch Oich.
 At the northern end there is the Bona Narrows which opens out into Loch Dochfour, which feeds the River Ness and a further section of canal to Inverness.
 It is one of a series of interconnected, murky bodies of water in Scotland; its water visibility is exceptionally low due to a high peat content in the surrounding soil.
Findlater Castle is the old seat of the Earls of Findlater and Seafield, sitting on a 50 ft -high cliff overlooking the Moray Firth on the coast of Banff and Buchan, Aberdeenshire, Scotland.
 It lies about 15 km west of Banff, near the village of Sandend, between Cullen and Portsoy.
 The cliffs here contain quartz; the name "Findlater" is derived not from Norse as earlier stated here, but from the Scots Gaelic words "fionn" ("white") and "leitir" ("cliff or steep slope").
 The first historical reference to the castle is from 1246.
 King Alexander III of Scotland repaired this castle in the 1260s in preparation for an invasion by King Haakon IV of Norway.
 The Vikings took and held the castle for some time.
 The castle remains that are still there are from the 14th-century rebuilding, when the castle was redesigned based on the Roslyn Castle model.
Qal'at Ja'bar (Arabic: قلعة جعبر‎ ‎ , Turkish: "Caber Kalesi" ) is a castle on the left bank of Lake Assad in Raqqa Governorate, Syria.
 Its site, formerly a prominent hill-top overlooking the Euphrates Valley, is now an island in Lake Assad that can only be reached by an artificial causeway.
 Although the hilltop on which the castle sits was possibly already fortified in the 7th century, the current structures are primarily the work of Nur ad-Din Zangi, who rebuilt the castle from 1168 onwards.
 Since 1965, several excavations have been carried out in and around the castle, as well as restoration works of the walls and towers.
 The castle was a Turkish exclave between 1921 and 1973.
St Andrew's Castle is a picturesque ruin located in the coastal Royal Burgh of St Andrews in Fife, Scotland.
 The castle sits on a rocky promontory overlooking a small beach called Castle Sands and the adjoining North Sea.
 There has been a castle standing at the site since the times of Bishop Roger (1189-1202), son of the Earl of Leicester.
 It housed the burgh’s wealthy and powerful bishops while St Andrews served as the ecclesiastical centre of Scotland during the years before the Protestant Reformation.
 In their Latin charters, the Archbishops of St Andrews wrote of the castle as their Palace, signing, "apud Palatium nostrum."
The Ness Islands (Scottish Gaelic: Na h-Eileanan Nis) are situated on the River Ness, opposite the Bught Park, in the city of Inverness, Scotland.
 The first bridges to the islands were built in 1828, prior to their construction the only access to the islands was by boat.
 The original bridges were washed away in the flood of 1849 and were replaced in 1853-1854 by two suspension bridges designed by William Dredge.
Inverness Castle (Scottish Gaelic: Caisteal Inbhir Nis) sits on a cliff overlooking the River Ness, in Inverness, Scotland.
 The red sandstone structure evident today was built in 1836 by architect William Burn.
 It is built on the site of an 11th-century defensive structure.
 Today, it houses Inverness Sheriff Court.
 There has been a castle at this site for many centuries.
 The castle itself is not currently open to the public, however a recent campaign has led to the creation of a working group to explore the possibility of doing so in the future.
 In April 2017 the north tower of the castle was opened to the public as a view point.
 At present, only the castle grounds and the north tower are open to the public.
Hammond Castle is located on the Atlantic coast in the Magnolia area of Gloucester, Massachusetts.
 The castle, which was constructed between 1926 and 1929, was the home and laboratory of John Hays Hammond, Jr. He was an inventor who was a pioneer in the study of remote control and held over four hundred patents.
 The building is composed of modern and 15th-, 16th-, and 18th-century architectural elements and sits on a rocky cliff overlooking Gloucester Harbor.
Inverness ( ; from the Scottish Gaelic: "Inbhir Nis" ] , meaning "Mouth of the River Ness") is a city in the Scottish Highlands.
 It is the administrative centre for the Highland council area, and is regarded as the capital of the Highlands.
 Inverness lies near two important battle sites: the 11th-century battle of Blàr nam Fèinne against Norway which took place on The Aird and the 18th-century Battle of Culloden which took place on Culloden Moor.
 It is the northernmost city in the United Kingdom and lies within the Great Glen (Gleann Mòr) at its north-eastern extremity where the River Ness enters the Moray Firth.
 At the latest, a settlement was established by the 6th century with the first royal charter being granted by Dabíd mac Maíl Choluim (King David I) in the 12th century.
 The Gaelic king Mac Bethad Mac Findláich (MacBeth) whose 11th-century killing of King Duncan was immortalised in Shakespeare's largely fictionalized play "Macbeth", held a castle within the city where he ruled as Mormaer of Moray and Ross.

Question: What castle sits on a cliff overlooking the River Ness and was part of the Scottish Civil War?
Answer: Inverness Castle