Zhàn zài shāndǐng, yǎnqián shì zhuàngkuò de dàhǎi.
From the summit, a vast and magnificent sea spread out before us.
Tips
usage
For seas, plains and skies, and also for great historical movements, as in 波澜壮阔 'surging on a grand scale'. 壮观 is for a sight that impresses; 壮阔 stresses its sheer breadth.