Question: Loch Shiel is part of the river that drains into the sea near the castle that sits west of what town?

Passages:
Angle (Welsh: "Angl" ) is a village and community on a narrow peninsula on the very south-west tip of Wales in Pembrokeshire.  It has two public houses, a school, post office, a castle, St Mary's church and a sandy beach to the west of the village.  The nearest railway station is Pembroke, from where there is a bus link.  The Angle lifeboat received silver medals in 1878 for rescuing the crew of the "Loch Shiel" from rocks near Thorn Island.  The ship had been carrying a cargo of whisky and beer. Polloch is a remote hamlet, located at the north shore of the River Polloch, in an inlet that flows into Loch Shiel, in Inverness-shire, Scottish Highlands and is in the Scottish council area of Highland. The Rough Bounds (Scottish Gaelic: "Na Garbh Chriochan" ), in the Scottish Highlands, is the area of West Inverness-shire bounded by Loch Hourn, Loch Shiel, and Loch Moidart, consisting of the districts of Knoydart, North Morar, Arisaig and Moidart.  The area is famous for its wildness and inaccessibility and remains very sparsely populated. Sgùrr Ghiubhsachain is a mountain in the Lochaber area in the west of Scotland.  Its summit is the highest point in a group of mountains that stand south of Glenfinnan, to the south east of the northern part of Loch Shiel.  It is considerably lower than the nearby Nevis range, but it is a long way from a public road.  Its slopes are steep and rugged on all sides and are devoid of paths.  Despite easy access to the trail head from the road from Fort William to Mallaig, an individual or party that climbs this mountain may be alone there, even on a fine day in the summer. Shiel Bridge is a village on the south east mouth of Loch Duich and confluence of the small loch in Loch Shiel and the River Shiel, in Lochalsh, Scottish Highlands and is in the council area of Highland. The River Shiel (Scottish Gaelic: Abhainn Seile) is a four kilometre long river in Acharacle, Highland.  It flows out of the Loch Shiel into the sea at Dorlin. Castle Tioram ( ) (Scottish Gaelic: "Caisteal Tioram" , meaning "dry castle") is a ruined castle that sits on the tidal island Eilean Tioram in Loch Moidart, Lochaber, Highland, Scotland.  It is located west of Acharacle, approximately 80 km from Fort William.  Though hidden from the sea, the castle controls access to Loch Shiel.  It is also known to the locals as "Dorlin Castle".  The castle is a scheduled monument. Loch Shiel (Scottish Gaelic: Loch Seile) is a 17+1/2 mi freshwater loch, 120 m (393 ft) deep, situated 12.4 miles west of Fort William in Lochaber, Highland, Scotland.  Its nature changes considerably along its length, being deep and enclosed by mountains in the north east and shallow surrounded by bog and rough pasture in the south west, from which end the 4 km River Shiel drains to the sea in Loch Moidart near Castle Tioram. Moidart ( , Scottish Gaelic: Mùideart ] ) is part of the remote and isolated area of Scotland, west of Fort William, known as the Rough Bounds.  Moidart itself is almost surrounded by bodies of water : Loch Shiel cuts off the eastern boundary of the district (along a south-south-west to north-north-east line), and continues along part of the southern edge; the remainder of the southern edge is cut off by Loch Moidart; the north is cut off by Loch Morar and Loch Ailort. The Glenfinnan Viaduct is a railway viaduct on the West Highland Line in Glenfinnan, Inverness-shire, Scotland.  Located at the top of Loch Shiel in the West Highlands of Scotland, the viaduct overlooks the Glenfinnan Monument and the waters of Loch Shiel.

Supporting sentences:
 Its nature changes considerably along its length, being deep and enclosed by mountains in the north east and shallow surrounded by bog and rough pasture in the south west, from which end the 4 km River Shiel drains to the sea in Loch Moidart near Castle Tioram. Castle Tioram ( ) (Scottish Gaelic: "Caisteal Tioram" , meaning "dry castle") is a ruined castle that sits on the tidal island Eilean Tioram in Loch Moidart, Lochaber, Highland, Scotland.  It is located west of Acharacle, approximately 80 km from Fort William.