El Paso, Texas, sits on the Rio Grande directly across from Ciudad Juárez, Mexico - together they form the largest binational metro area on the US-Mexico border. The Spanish name means 'the pass' (the mountain pass between the Franklin and Juárez ranges). Often written without the dot as 埃尔帕索.
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埃尔 (Āi'ěr) for 'El' is the standard Spanish-article transliteration (compare 埃尔多拉多 'El Dorado,' 埃尔南德斯 'Hernández'). 帕索 (Pàsuǒ) renders 'Paso' - same 帕 used in 帕里斯 (Paris/Park-style names).