Place
- Africa2
- Alabama20
- Alagoas (Brazil)4
- Alameda County (Calif.)3
- Alaska20
- Albemarle Sound (N.C.)7
- Albion River Watershed (Calif.)4
- Algeria1
- Amapá (Brazil : Territory)3
- Amazonas (Brazil)4
- Andhra Pradesh, India1
- Antarctic Ocean2
- Antarctica1
- Arce (Brazil)4
- Arctic Ocean261
- Arizona20
- Arkansas20
- Aromas (Calif.)9
- Arunachal Pradesh, India1
- Asia1