1. INTRODUCTION

2. DATA
2.1. The Keck Baryonic Structure Survey
2.2. QSO spectra

3. PIXEL OPTICAL DEPTH

4. LYα ABSORPTION NEAR GALAXIES
4.1. 2-D Maps of the median Lyα absorption
4.2. Redshift space distortions
4.3. Lyα absorption as a function of 3-D Hubble distance
4.4. Lyα absorption as a function of transverse distance
4.5. Interpreting PODs
4.6. Circumgalactic matter

5. THE DISTRIBUTION OF GALAXIES AROUND ABSORBERS

6. SUMMARY & CONCLUSIONS