Which by his strength
koach (ko'-akh)
from an unused root meaning to be firm; vigor, literally (force, in a good or a bad sense) or figuratively (capacity, means, produce); also (from its hardiness) a large lizard
setteth fast
kuwn (koon)
to be erect (i.e. stand perpendicular); hence (causatively) to set up, in a great variety of applications
the mountains
har (har)
a mountain or range of hills (sometimes used figuratively) -- hill (country), mount(-ain), promotion.
being girded
'azar (aw-zar')
to belt -- bind (compass) about, gird (up, with).
with power
gbuwrah (gheb-oo-raw')
force; by implication, valor, victory -- force, mastery, might, mighty (act, power), power, strength.