| Livistona australis (cabbage-tree palm)
|
Plant |
| Lockleys Pylon
|
Geological feature |
| Loftus Creek
|
River or creek |
| Long Bay
|
Bay or cove |
| Long Bay, Middle Harbour
|
Bay or cove |
| Long Island
|
Island |
| Looking Glass Bay
|
Bay or cove |
| Looking Glass Point
|
Headland or point |
| Lovers Jump Creek
|
River or creek |
| Macdonald River (Gunanday)
|
River or creek |
| Mackenzies Bay
|
Bay or cove |
| Major's Bay
|
Bay or cove |
| Malabar Beach
|
Beach |
| Mangrove Creek
|
River or creek |
| Manly Lagoon
|
Lake or lagoon |
| Manns Point
|
Headland or point |
| Marlo Creek (Malu)
|
River or creek |
| Marlows Gully
|
River or creek |
| Maroubra Beach
|
Beach |
| Marramarra Creek
|
River or creek |
| Matahil Creek
|
River or creek |
| Megalong Valley
|
Valley |
| Melon Creek (Melong)
|
River or creek |
| Middle Harbour
|
Bay or cove |
| Middle Head
|
Headland or point |
| Miles Gully
|
Valley |
| Mill Creek
|
River or creek |
| Mobbs Hill
|
Hill or mountain |
| Mooney Mooney Point
|
Headland or point |
| Morrisons Bay
|
Bay or cove |
| Mortlake Point
|
Headland or point |
| Mosman Bay
|
Bay or cove |
| Mount Banks
|
Hill or mountain |
| Mount Hay
|
Hill or mountain |
| Mount Hunter
|
Hill or mountain |
| Mount Hunter Rivulet
|
River or creek |
| Mount Rennie
|
Hill or mountain |
| Mount Solitary
|
Geological feature |
| Mount Yengo
|
Hill or mountain |
| Mrs Macquarie's Point
|
Headland or point |
| Muddy Creek
|
River or creek |
| Mullet Creek
|
River or creek |
| Narellan Creek
|
River or creek |
| Narrabeen Creek
|
River or creek |
| Narrabeen Lagoon
|
Lake or lagoon |
| Narrow Neck
|
Geological feature |
| Nepean River
|
River or creek |
| Neverfail Bay
|
Bay or cove |
| North Head
|
Headland or point |
| Oatley Bay
|
Bay or cove |