Place
- Africa2
- Alabama18
- Alameda County (Calif.)6
- Alaska20
- Albemarle Sound (N.C.)7
- Albion River Watershed (Calif.)4
- Algeria1
- Amador County (Calif.)1
- Antarctic Ocean2
- Antarctica1
- Arctic Ocean259
- Arizona18
- Arkansas18
- Asia1
- Atlantic Coast (New England)1
- Atlantic Ocean5
- Australia1
- Baltimore Canyon7
- Berkeley (Calif.)1
- Block Island Sound (R.I.)1