  Extended nebulae of Ly-alpha emission ("Ly-alpha blobs") are known to be
associated with overdense regions at high redshift. Here we present six large
Ly-alpha blobs in a previously known protocluster with galaxy overdensity delta
~ 7 at z = 2.3; this is the richest field of giant Ly-alpha blobs detected to
date. The blobs have linear sizes >~100 kpc and Ly-alpha luminosities of ~10^43
erg/s. The positions of the blobs define two linear filaments with an extent of
at least 12 comoving Mpc; these filaments intersect at the center of one of the
blobs. Measurement of the position angles of the blobs indicates that five of
the six are aligned with these filaments to within ~10 degrees, suggesting a
connection between the physical processes powering extended Ly-alpha emission
and those driving structure on larger scales.
