Coverage is uneven, so these are the profiles with the most behind them. This ranks what Hydrionis holds about a country — not the country's water situation, which is a different question and not one a coverage figure can answer.

Ranked by indicators held, with monitoring series breaking ties. What is missing for every country, and what would close it, is in coverage and gaps.

• What the record is showing — findings computed from the data
• Monitoring networks — every gauge, borehole and raingauge held, by country
• Rankings — only where the metric is genuinely rankable
• Comparisons — enumerated pairs, checked for comparability
• Coverage and gaps — what is held and what is not, per country and metric