▁of ▁the ▁early ▁S ino - T ib et an ▁Long sh an ▁culture . ▁Fort ifications ▁like ▁walls ▁( as ▁well ▁as ▁extensive ▁mo ats ▁in ▁Li ang z hu ▁cities ) ▁are ▁common ▁features ▁in ▁settlement s ▁during ▁this ▁period , ▁indicating ▁w ides p read ▁conflict . ▁This ▁period ▁also ▁coinc ides ▁with ▁the ▁south ward ▁movement ▁of ▁rice - f arm ing ▁cult ures ▁to ▁the ▁L ing nan ▁and ▁F uj ian ▁regions , ▁as ▁well ▁as ▁the ▁south ward ▁migr ations ▁of ▁the ▁Aust ron esian , ▁Kra - D ai , ▁and ▁Aust ro asi atic - spe aking ▁pe op les ▁to ▁Main land ▁S out heast ▁Asia ▁and ▁Island ▁S out heast ▁Asia . ▁ ▁Aust ron esian ▁expansion ▁ ▁The ▁spread ▁of ▁japon ica ▁rice ▁cultiv ation ▁and ▁p addy ▁field ▁agricult ure ▁to ▁S out heast ▁Asia ▁started ▁with ▁the ▁migr ations ▁of ▁the ▁Aust ron esian ▁D ap enk eng ▁culture ▁into ▁Taiwan ▁between ▁ 3 5 0 0 ▁to ▁ 2 0 0 0 ▁BC ▁( 5 , 5 0 0 ▁B P ▁to ▁ 4 , 0 0 0 ▁B P ). ▁The ▁N angu an li ▁site ▁in ▁Taiwan , ▁dated ▁to ▁ca . ▁ 2 8 0 0 ▁BC , ▁has ▁yield ed ▁numerous ▁carbon ized ▁remains ▁of ▁both ▁rice ▁and ▁mil let ▁in ▁water log ged ▁conditions , ▁indicating ▁int ensive ▁wet land ▁rice ▁cultiv ation ▁and ▁dry land ▁mil let ▁cultiv ation . ▁ ▁From