Just for you to recap:

Part I.Visit London’s East End

THE EAST END

That is, those areas immediately to the East and the North-East of the CITY OF LONDON boundaries, coinciding almost exactly with the boundaries of the LONDON BOROUGH OF TOWER  HAMLETS

Part II. Enjoy East London.

The EAST LONDON districts to the West of the RIVER LEA

You are going to explore the LONDON BOROUGHS OF HACKNEY, HARINGEY and ENFIELD

Part III. Explore more of East London.

Discovering the the RIVER itself and its VALLEY 

You are going to explore àrees OF the LONDON BOROUGHS OF TOWER HAMLETS, HACKNEY, WALTHAM FORESTAL, HARINGEY and ENFIELD

Part IV: KEEP DISCOVERING EAST LONDON.                        The districts EAST of the RIVER LEA and its VALLEY

On the map, I pointed out the KING GEORGE V RESERVOIR, and you can see the course of the LEA part of GREATER LONDON (South of the M25) covered in PART III

STRATFORD.           WEST HAM              EAST HAM.       BECKTON

LEYTON     LEYTONSTONE  WALTHAMSTOW     HIGHAMS PARK   CHINGFORD         EPPING FOREST

VALENTINES PARK  BARKING             ILFORD         BECONTREE

CANNING TOWN.   ROYAL DOCKS.    NORTH WOOLWICH