The 30th parallel north is a circle of latitude that is 30 degrees north of the Earth's equatorial plane. It stands one-third of the way between the equator and the North Pole.
It is the approximate southern border of the horse latitudes in the Northern Hemisphere, meaning that much of the land area touching the 30th parallel is arid or semi-arid. If there is a source of wind from a body of water the area would more likely be subtropical.
Starting at the Prime Meridian and heading eastwards, the parallel 30° north passes through:
| Country, territory or sea | Notes |
|---|---|
| Persian Gulf | |
| East China Sea | |
| Island of Kuchinoshima | |
| Pacific Ocean | |
| Baja California Peninsula | |
| Gulf of California | |
| Texas Louisiana |
|
| Gulf of Mexico | |
| Florida | |
| Atlantic Ocean | |
|
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