bracelet (made of stringed jewels or bells and worn at the elbow), bracer (for the elbow of an archer)

environment, surroundings, circumstances

(finger) ring

circulation, rotation, cycle...

vicious circle, vicious cycle

Environment Agency

annulation, ring shape, loop shape

return current, convection, reflux

wreath, garland

(circular) moat

atoll, circular coral reef

environmental protection

circulatory organ

environmental problem, environmental issue

looking around, looking about

environmental hygiene

circle, ring

(animal) collar, necklace, choker

loop line, (transportation) belt line

natural environment, (the) environment

work environment

system requirements (i.e. recommended hardware and software to run a package)

Pacific Rim

segment (of worm)

surrounding seas, surrounded by the sea

cyclization, cyclisation

ring finger

atlas

pastry made of dough pulled into various shapes and fried

annulus