Reach

Reach is a static ability that enables a creature to block another creature with flying.

Comprehensive Rules
702.17. Reach

702.17a Reach is a static ability.

702.17b A creature with flying can’t be blocked except by creatures with flying and/or reach. (See rule 509, “Declare Blockers Step,” and rule 702.9, “Flying.”)

702.17c Multiple instances of reach on the same creature are redundant.