- - What high ground is above (2 words)
- - It's used in reckoning land elevation
- - It rises every year
- - High ground is above it
- - Death Valley is below it
- - It's affected by global warming
- - Denver is way above it
- - Part of New Orleans is below it
- - The Caspian is just below it
- - Elevation reference point [2 wds.]
- - First woman among all to follow south-east geographical measuring base
- - Aluminium lined sleeve frayed at low altitude
- - Elevation benchmark
- - Climatologist's concern
- - Rising concern?
- - Elevation standard
- - Zero point for map heights
- - At this point land appears
- - Marine standard
- - Something on the rise today
- - Reference point for heights
- - Surface area?
- - Altitude baseline
- - 0, in some measures
- - 0 on an altimeter
- - What many port cities are at
- - Cruising altitude?
- - Land formation measuring standard
- - Where many geographical measurements begin
- - Average height of the ocean's water
- - Altitudinal reference
- - Standard reckoning in elevation
- - Zero altitude
- - Aquatic plane
- - Standard for measuring heights
- - Standard for altitudes
- - Standard for measurement of heights.
- - Standard measure for height of land.
- - Standard for height measurements.
- - See 57-across
- - Where the buoys are
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