Loch Indaal slopes gently from its northeast corner down to its opening into the Atlantic. At the mouth of the loch, which lies between
Portnahaven to the north and the American Monument on
The Oa to the south, the depth is around 40 metres, rising steadily upwards towards the northeast and reaching a depth of barely 10 metres between Laggan Point and Port Charlotte. The waters of the loch are calm and safe but the approaches are hazardous especially for small vessels. There are tidal streams, eddies, races and heavy overfalls both in the east and west flowing streams of the tide. ==The Big Strand and Laggan Bay==