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The edge of Texas at the Rio Grande near Boquillas Canyon

When the Rio Grande is swollen with rain, as it was recently in Laredo, it’s hard to tell that more than 5 million gallons of raw sewage spill into its waters every day. But kayak through the little creeks on the side of the river bordering Mexico, and the odor is unmistakable. Read more»

Steeped in the annals of America's symbiotic relationship with Mexico is the two countries’ long-standing and sometimes tense agreement over an issue more far-reaching than border security and immigration: water. Read more»