How big is CBP's jurisdiction?

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I vaguely remember hearing somewhere that U.S. Customs and Border Patrol has a jurisdictional definition that allows them to be active a certain number of miles from international ports of entry, and that this jurisdictional definition allows them to act within most major cities, since large airports are considered ports of entry.
Can someone give me a link that explains the exact radius in miles within which CBP can act?
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Who controls Border Patrol?
Chris Magnus is the Commissioner of U.S. Customs and Border Protection (CBP). In this leadership position, he oversees 60,000 employees, manages a budget of over $15 billion, and ensures the effective operations of CBP's mission to protect national security while promoting economic prosperity.What two borders do Border Patrol work?
The Border Patrol is specifically responsible for patrolling the 6,000 miles of Mexican and Canadian international land borders and 2,000 miles of coastal waters surrounding the Florida Peninsula and the island of Puerto Rico. Agents work around the clock on assignments, in all types of terrain and weather conditions.How many countries is CBP in?
CBP operates Attach\xe9 Offices in 23 countries around the world.How many Border Patrol agents are there in 2021?
Employed 64,272 men and women including: 25,914 CBP officers. 2,693 CBP Agriculture specialists. 19,536 Border Patrol agents.Yulia Lama | CBPeople | CBP
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