The crossword solution for the term 'AGUA, ACROSS THE PYRENEES' is 'EAU', which is the French word for water. Agua is the Spanish word for water, and the Pyrenees are a mountain range that form a natural border between France and Spain. Therefore, the solution to this crossword clue is 'EAU', as it is the French word for water, which is the same as the Spanish word for water, and it is found across the Pyrenees.