An expression meaning 'to this extent' or 'so much/this much.' Often used in constructions like 'I didn't expect it to be this much.'
これほど美しい景色は見たことがない。
I've never seen a view this beautiful.
彼が助けてくれるとは、これほど心強いことはない。
There's nothing as reassuring as him helping me.
これほどの努力が実を結ぶとは思わなかった。
I didn't expect such effort to pay off.