Bosworth & Toller Anglo-Saxon Old English Dictionary - heaþu-sigel
According to the Old English Dictionary:
heaþu-sigel
Add : For a passage connecting the sun with the sea
Related words:Ph. 120 :-- Sóna swá seó sunne sealte streámas heá oferhlifað (the original Latin has no reference to the sea : Ubi sol pepulit fulgentis limina portae). heaðu-sigel,heaþu-sigel