Be central or dominant.

Roget 223: cover; superpose, superimpose; overlay, overspread; wrap etc. 225; encase, incase^†; face, case, veneer, pave, paper; tip, cap, bind; bulkhead, bulkhead in; clapboard [U.S.].    coat, paint, varnish, pay, incrust, stucco, dab, plaster, tar; wash; besmear, bedaub; anoint, do over; gild, plate, japan, lacquer, lacker^†, enamel, whitewash; parget^†; lay it on thick.    overlie, overarch^†; endome^†; conceal etc. 528.    [of aluminum] anodize.    [of steel] galvanize.    ... meer laten zien

Form an arch over:
— Big rocks overarch the stream.

synoniem: arch over.