[1] In addition to being relatively difficult to access physically due to the steepness of the surrounding country, it is closed to the public in the summer months (November–February) to protect the yellow-eyed penguins that nest on it.
Near the eastern end a stretch of about 200 metres (660 ft) is sandy; the remainder is covered in boulders, hence the beach's name.
To the east Boulder Beach is truncated by a series of headlands which culminate in Seal Point, followed by Sandfly Bay.
A river called Robertsons Creek flows off Sandymount to cross Boulder Beach about halfway along its length.
The scrub adjacent to the beach is a favoured nesting spot for yellow-eyed penguins, and since these birds are very shy about nesting or breeding where they may be seen by humans,[5] Boulder Beach Track has been closed to the public during their breeding season since 2005,[6] initially from December to February, but more recently from November to February.