San Ysidro is a community of San Diego, California. Although administratively part of the City of San Diego, San Ysidro is geographically separated from the rest of the city by the entities of Chula Vista and National City just to the north. San Ysidro is often cited as the world's busiest land border crossing, where U.S. Interstate 5 crosses into Tijuana, Mexico.
Technically, San Ysidro is only the neighborhood closest to the border crossing. This article includes adjacent neighborhoods in South San Diego, including the Otay Mesa area, Palm City, and the Tijuana River Valley.
On the U.S. side, I-5 and I-805 connect San Ysidro to the communities to the north. You can drive to the border crossing and then continue driving through, or park at one of the lots and walk through. Parking at one of the lots costs about $4-9 a day. Traffic is pretty heavy coming up from Mexico.
The San Diego Trolley Blue Line service connects San Ysidro to Chula Vista, National City, and Downtown San Diego to the north. Standard one-way fares are $2.50, with day passes running at $5, and there are 2, 3 and 4 day passes available.
- 1 Tijuana River Valley Regional Park. An 1800-acre San Diego County park along the Mexican border. Includes a bird and butterfly garden and a sports complex.
- 2 Smuggler's Gulch. A valley previously known for smuggling and unauthorized travel between the United States and Mexico, leading to the construction of a large embankment blocking the valley at the border.
- 3 Border Field State Park, ☏ . Mainly within Imperial Beach, but only accessible from San Ysidro. Includes the International Friendship Park, which is just inland from the place where the border meets the ocean. The road within the park is only open on weekends when there is no flooding, but the park itself is still open when the gates are closed.