| 11. | The river freezes up in late October and stays icebound until early May.
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| 12. | The Ilych freezes up in early November and stays icebound until late April.
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| 13. | The river freezes over in late November and is icebound until early April.
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| 14. | On 24 January 1955 she assisted an icebound tug and barges near Detroit.
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| 15. | Aksu freezes in December and stays icebound until March.
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| 16. | And, in any case, the north-flowing rivers are icebound now.
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| 17. | Their ship became icebound and was eventually crushed.
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| 18. | The lake is icebound during most winters and most of spring during freeze years.
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| 19. | This plan was frustrated, as " Discovery " remained firmly icebound.
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| 20. | The Nera freezes up in October and remains icebound until May-early June.
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