Loch Indal, a sea loch in Islay island, Argyllshire. Opening on the S between the Mull of Islay and the Point of Rhynns, and penetrating 12 miles north-north-eastward to the centre of the island, it measures 8 miles across the entrance, and contracts gradually over the first 4¾ miles to a breadth of 62/3 miles. It then expands on the E side into Laggan Bay, then over the last 6½ miles has an average breadth of only about 2 miles; and, though all comparatively shallow, is much frequented by shipping, and abounds in fish. A lighthouse, designated of the Rhynns of Islay, stands on Oversay islet, adjacent to the W side of the loch's entrance, and shows a flashing light every 5 seconds, visible at the distance of 17 nautical miles; and another lighthouse, designated of Loch Indal, stands on Dune Point, and shows a fixed white light from NE by E to about N by E half E, a red light from about N by E half E to about W half N, and a white light from about W half N to SW by W three-quarters W, visible at the distance of 12 nautical miles. Dioptric prisms of a new form were introduced to the latter lighthouse in 1869.
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