| Where many geographical measurements begin |
USA Today |
12 Mar 2026 |
| It's used to calculate the height of mountains (3-5) |
The Guardian Quick |
04 Dec 2025 |
| Hydroplane? |
Universal |
13 Nov 2025 |
| Coastal concern |
LA Times Daily |
22 Dec 2024 |
| Zero height, except in rough weather? (3,5) |
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| No measure of height when ocean is calm (3,5) |
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| Measure used in estimating land elevation (3,5) |
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| Measure of height, in the main? (3,5) |
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| Average ocean water height: 2 wds. |
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| Above which to be high and dry |
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| Benchmark for measuring elevation |
USA Today |
25 Apr 2024 |
| Height of the ocean (3,5) |
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| Standard used for geographical height measurements (3,5) |
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| At this point land appears! |
The Sun Two Speed |
21 Jan 2024 |
| Zero on altimeter |
The Sun Two Speed |
21 Jan 2024 |
| Elevation standard |
Eugene Sheffer |
03 Nov 2023 |
| Engineer leaves the Spanish geographer's base |
The Telegraph Cryptic |
20 Oct 2023 |
| What high ground is above (2 words) |
Family Time |
03 Apr 2022 |
| Rising concern? |
New York Times |
04 Jan 2021 |
| Rising concern? |
Universal |
29 Nov 2020 |
| Elevation standard |
Newsday |
03 Jul 2019 |
| See 57-Across |
USA Today |
12 Feb 2019 |
| Zero point for map heights |
The Sun Two Speed |
06 Jan 2019 |
| At this point land appears |
The Sun Two Speed |
06 Jan 2019 |
| See 57-Across |
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| Marine standard |
Newsday |
22 Dec 2018 |
| Something on the rise today |
New York Times |
25 Nov 2018 |
| Reference point for heights |
The Times Concise |
16 Nov 2018 |
| Surface area? |
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| Something on the rise today |
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| Rising concern? |
Wall Street Journal |
22 Nov 2017 |
| It's used in reckoning land elevation |
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| Altitude baseline |
Universal |
01 Feb 2017 |
| 0, in some measures |
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| 0 on an altimeter |
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| Elevation standard |
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| What many port cities are at |
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| High ground is above it |
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| It rises every year |
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| Cruising altitude? |
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| Altitude baseline |
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| Land formation measuring standard |
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| Where the buoys are |
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| It's affected by global warming |
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| Death Valley is below it |
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| Altitude baseline |
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| Where many geographical measurements begin |
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| Where many geographical measurements begin |
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| Altitude baseline |
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| Death Valley is below it |
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| Average height of the ocean's water |
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| Denver is way above it |
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| Altitudinal reference |
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| Part of New Orleans is below it |
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| 0, in some measures |
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| Standard reckoning in elevation |
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| Death Valley is below it |
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| Zero altitude |
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| The Caspian is just below it |
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| 0, in some measures |
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| Aquatic plane |
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| Standard for measuring heights |
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| Standard for altitudes |
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| Standard for measurement of heights. |
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| Standard measure for height of land. |
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| Standard for height measurements. |
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