- - Like navigable Arctic waters
- - Navigable in winter, say
- - Navigable year-round
- - Good for a port to be so but not for a gin and tonic
- - Increasingly describing the Arctic, unlike the first answer?
- - Like much of the Arctic in summer
- - Fierce, wild extreme climate without frost
- - Unfrozen, as harbors
- - (Of water) not frozen
- - Warming Arctic may become so fierce, spoiling one of Earth's extremes
- - Without frost
- - Easy to navigate, in a way
- - Clear, as winter windshields
- - Like some winter ponds
- - Unfrozen as a harbor
- - Some winter ports
- - Like Murmansk's harbor
- - Like some northern ports
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